Elastic belt



Patented July 12, 1932 UNITED STATES PATENT oFFIcE LOUIS E. VON OHLSEN, OF NEW HAVEN, CONNECTICUT, ASSIGNOR T THE SAFETY CAR HEATING & LIGHTING COMPANY, A. CORPORATIN OFNEW JERSEY ELASTIC BELT Application iled April 6, 1929'. Serial No. 353,171.

This invention relates to elastic belts for the transmission of motion and power.

One of the objects thereof is to rovide a simple, cheap and eicient article o the character described. Another object is to provide `a practical elastic transmission belt which may be easily manufactured and which in use will prove both strong and durable. A third object is to provide a belt which `:vill be practically free from certain undesirable characteristics that commonly develop in the use of belts of the general character above described. Other objects will be in part obvious and in part pointed out hereinafter. The invention accordingly consists in the features of construction, combination'of elements and arrangements of parts which will be exemplified in the structure to be hereinafter describedl and 'the scope of the application of which will be .indicated in the following claims.

In the accompanying drawing,in which is shown one of various possible embodiments of my invention, T

Figure 1 is a side elevation of a belt constructed in accordance with my invention,

and a pair of associated pulleys;

Fig. 2 is a view showing a section of thel belt with a portion of the covering removed;

Fig. 3 is a cross-section of a belt showing its internal construction; and l Fi s. 4 and 5 are sectional views illustrating t e use of mbeltwvith pulleys of different surface configurations.

` Similar reference characters refer to similar parts throughout the several views of the drawing.

Now referring to the drawing in detail, a belt is shown generallyat 1, surrounding in operative relation a pair of pulleys 2 and 3. By reference to Figs. 2 and 3, it will be seen that the belt 1 consists of a stranded elastic core 4 and a fabric covering 5. The manufacture thereof may be economically and practically accomplished by building up the core 1 in the following manner: A continuous strip of rubber elastic of any preferred cross-sectional shape is woundv upon a mandrel of a diameter suitable for providing a Aare joined together by cement, or in any other suitable manner, as is indicated at 6 in Fig. 2.

There results thenl a continuous elastic core'built up in the -form of a plurality of coils produced byv serially windin from a single strip of elastic material. he core .thus constituted is then provided with an outer covering or sheath of cotton or other fabrlc material, which may consist of one or more layers, braided on the core continuously from a point at the beginning, `alon the circumferential length of the core, and ack to the said point, as is clearly shown in Fig.

1. rI he ends of the braided covering, where v they meet, lare then wrapped with cord or twine, as'shown at. 7: in Fig. 1. y

It should not be inferred from the above description that applicant limits his invention to the specific form of core described, for it is within the scope of `his invention to employ a solid core or to construct the core in other fashion, as, for example, by grouping together in one. bundle, continuous elastic bands ofthe proper length, in numbers suficient to give the requisite strength and tenslon. 1

Several important advantages accrue from the employment of a fabric-covered belt having a stranded rubber core. Its manufacture is extremely simple and inexpensive. Belts ofanyrequired tension are easily provided and standardized. In use, the great flexibility of the completed belt is a decided advantage, for it may be made to conform closelyk to the friction surface of pulleys of widely diifering shape. Fig. 4 shows how the belt adapts itself to pulleys .having acutely grooved surface 4 while Fig. 5 shows its equal adaptability for use with pulleys of\ more open conformation.

It has been found inf/practice that belts 'No consisting of a singleL piece of bare molded rubber have a tendency to break down in service, through the development of transverse cracks and ultimate fracture. This undesirable feature is largely obvi'ated by the` use of solid or, preferably, stranded rubber cores protected by extensible fabric coverings. Then, too, when bare rubber is used, the friction developed along its surface of cont-act with the pulley tends to make it sticky and adherent to the surface of the pulley. This elfect may be so pronounced as to l well adapted to attain the ends and objects thereon in a thoroughly practical manner.

As lmanytpossible embodiments may be made of the above invention and as many changes might be made in the embodiment above set forth, it is to be understood that all matter hereinbefore set forth or shown in the accompanying drawing is to be interpreted as illustrative and not in a limiting sense. I

I claim: f

1. A power transmission comprising, in

combination, a drive-pulley, a driven pulley, and a transmission belt connecting said pul- `leys, said belt comprising an endless strip of elastic material forming a plurality of strands looped about said pulleys and adapted resiliently to transmit motion from said drive-pulley to said driven pulley.

2. A power transmission comprising, in combination, a drive-pulley, a driven pulley, and a transmission belt connecting sa1d pulleys, said .belt comprising a strip of elastic material wound in a plurality of turns about said pulleys andfhavingg;l its ends joined to form a continuous resilient member.

3. A power transmission comprising, in combination, a drive-pulley, a driven pulley, a transmission belt connecting said pulleys, said belt comprising an endless strip of elastic material forming `a plurality of strands looped about said pulleys and adaptedresiliently to transmit motion from said drivepulley to said driven, pulley, and a fabric covering said plurality of strands of elastic material for preserving said elastic material from deterioration due to friction.

power transmission comprising in combination, a drive-pulley, a driven pulley, a transmission belt conneting said pulleys,

lsaid belt comprising a strip of elastic material wound in a plurality of turns about said pulleys and having its ends joined to form a continuous resilient member, and an extensible fabric coverin said transmission member rto permit stretc ing of said member but preventing deterioration thereof by reason of frictional heat.

5. A power transmission comprising, in combination, a drive-pulley, a driven pulley, and a transmission belt connecting said pulleys, comprising a stranded elastic core and a braided covering enveloping said core, said covering being of a nature to permit limited stretching of said core while protecting it from contact with said pulleys.

6. A power transmission comprising, in combination, a drive-pulley, a driven pulley, and an elastic transmission belt connecting said pulleys, comprising a body composed wholly of rubber and a braided covering enveloping said body, said covering being of a nature to permit limited stretching of said 'body while protecting it from Contact with said pulleys.

In testimony whereof, I have signed my name to this specification lthis 1st day of April, 1929.

LOUIS H. VON OI-ILSEN. 

